RubyPlus #27

https://www.rubyplus.com/podcasts/321-Episode-27

• Mastering Ruby Exceptions
  • free 39 pages book
• Reading Ruby Code: Ruby Object Mapper - Exploration
  • rom = ROM.container(:sql, 'sqlite::memory') do |conf|
    • require 'pry'; binding.pry
• Google App Engine adds C#, Node.js, and Ruby options
  • already supported Go, Java 8, PHP 5-7, and Python 2 and 3
• Faster Rails: How to Check if a Record Exists
  • Loading too much data into memory
  • N+1 queries
  • lack of cached values
  • the lack of proper databases indexes
  • advice is to always use exists?
    • present? => 2892.7 ms, any? => 400.9 ms, empty? => 403.9 ms, exists => 1.1 ms
• Testing Third Party Interactions
  • Stubbing the network
    • stub_request
• Google Spreadsheets and Ruby
  • Go to the Google APIs Console.
  • Click Enable API. Search for and enable the Google Drive API.
• Smarter CSV
  • direct processing with Mongoid or ActiveRecord
  • parallel processing with Resque or Sidekiq
• Towards Minimal, Idiomatic, and Performant Ruby Code
  • necessary to trade performance for readability, or readability for performance
• ODBC and writing your own ActiveRecord adapter
  • ODBCAdapter.register
• Micro-optimizations matter: preventing 20 million system calls
  • sigprocmask
• ActiveRecord Prepared Statements Can Cause Memory Leaks
  • statement_limit: 200 in config/database.yml
• Ruby ActionCable Client
  • Client for integrating a ruby application with a remote ActionCable-based backend
  • EventMachine.run do
    • url = 'ws://example.com'
• Easily Translate Enums in Rails.
  • i18n Post.translated_status(:published) #=> "Was published"